Step by step instructions
Begin in a modified pushup position with hands shoulder width, knees bent and together. Lower into a triceps pushup by bringing chest as close to the floor as possible with elbows in tight by sides (make it harder by staying on toes for pushup).
Extend arms and quickly straighten legs out into a full plank position. Keeping abs in tight, rotate body to the left as left arm extends up over shoulder, stacking hips and feet into a full side plank position. Return to start; repeat on opposite side.